Dear An: We are sorry to hear about your pregnancy loss and subsequent infection (septic miscarriage) last spring. As you may have been told, with an impending miscarriage HGC levels do not double every 48 hours. Instead, they may either rise very slowly or become detectable then fall. This MIGHT explain why it took two weeks to detect that pregnancy.
I can understand your concern, given your experience. You should have a current pregnancy ruled out. You mentioned it took two weeks to test positive with your last pregnancy; currently you have tested multiple times in the past 75 days. I would urge you to at least get a pregnancy test from Planned Parenthood.They can even order a blood test if indicated.
If your pregnancy test is negative then the next most common cause of a missed period is not having ovulated that cycle(s). In a normal cycle, estrogen is produced all month. Estrogen is responsible for building up the lining of your uterus so you have something to shed each month.
In a normal cycle, progesterone production increases following ovulation. Progesterone "stabilizes" the uterine lining in preparation for a possible implantation of a new pregnancy. If you are not pregnant that month the levels of estrogen and progesterone fall, triggering the release of the uterine lining—your period.
So, if you do not ovulate, the estrogen build up of the lining continues, but without the usual ovulation associated progesterone. Thus, the hormone levels don't decline, and the lining stays up inside the uterus—your missed period(s).
If you have been several months without a period, a gynecologist may give you some progesterone in a pill form (eg Provera 10 mg for 5 days). Within 48-72 hours after stopping the progesterone your "progesterone blood level" will fall, triggering the release of the lining that has been building up. Many women report that these periods are very heavy-- as though several months of lining are shed.
Causes for not ovulating are multifold: thyroid problems, pituitary problems, ovarian cysts, physical stressors (eg sudden increases in exercise, crash dieting), emotional stressors (problems with boyfriends/girlfriends, finances), increased body weight, anorexia, rotating shifts at work, etc.
There is a second, less common cause for not having a period. In some women the estrogen levels become very low. The levels are so low that no uterine lining is available to be shed. When these women are given the progesterone pills to take, no flow occurs after the medication is finished. This tells the GYN that the woman is not making enough estrogen to produce a thickened uterine lining.
Bottom line, please get a pregnancy test in a clinic. After three months it is considered time to try a short course of generic progesterone. If you have a bleed--the diagnosis is non-ovulation. If you do not have a bleed--low estrogen and more testing is needed.
In Support,
Jane